Low-viscosity concentrated solutions of alkaline earth metal alkoxides in aprotic solvents and processes for preparation thereof
A solution of a mixed alkaline earth alkoxide compound with an aluminum compound in an aprotic solvent, and methods of making and using them.
1. A solution comprising a mixed alkaline earth alkoxide compound of formula M(OCH 2 R 6 ) 2-a-b (OR 7 ) a [(CHR 8 ) n OR 9 ] b in a mixture with an aluminum compound of formula Al(OCH 2 R 6 ) 3-c-d (OR 7 ) c [O(CHR 8 )—OR 9 ] d in an aprotic solvent, wherein
M is an alkaline earth metal selected from Mg, Ca, Ba, and Sr;
OCH 2 R 6 is an alkoxide radical composed of at least 3 and a maximum of 40 C atoms having a branch in the 2-position, relative to O;
R 7 is an alkyl radical containing 2-15 C atoms which is either linear or has a branch at the 3- or higher position relative to O;
O(CHR 8 ) n OR 9 is an alkoxide radical in which
R 8 is an alkyl radical containing 1-6 C atoms which is either linear or has a branch at the 3- or higher position relative to O;
R 9 is an alkyl radical containing 2-15 C atoms which is either linear or has a branch;
n is an integer between 1 and 4;
a+b≦2;
c+d≦3;
a and c are from 0.01 to 0.8; and
b and d each range from 0.1 to 1.99; and
wherein the solution has a content of aluminum relative to the alkaline earth metal in the range between 0.2 and about 20 mol %.
2. The solution according to claim 1 , characterized in that the alkaline earth metal has a concentration in the range of 0.4 to 1.6 mmol/g.
3. The solution according to claim 1 , characterized in that the solution has a viscosity of ≦300 cP at room temperature.
4. The solution according to claim 1 , characterized in that the solution has a content of protic impurities relative to the alkaline earth metal between 0.1 and 40 mol %.
5. The solution according to claim 1 , wherein O(CHR 8 ) n OR 9 is derived from a C 2 -C 4 glycol monoether.
6. The solution according to claim 1 , wherein O(CHR 8 ) n OR 9 is derived from an alcohol selected from the group consisting of 2 ethoxyethanol, 3-ethoxy-1-propanol, 3-ethoxy-1-butanol, 2-(2-ethylhexoxy) ethanol, 2-butoxyethanol, 2-hexyloxyethanol and 1,3-propylene glycol monobutyl ether.
7. The solution according to claim 1 , characterized by containing 0.1 to 80 mol % free alcohol relative to the alkaline earth metal.
8. A method comprising preparing Ziegler-Natta polymerization catalysts with a solution of claim 1 .
9. A method comprising performing an organic synthesis, wherein a solution of claim 1 is used in the organic synthesis.
10. The solution according to claim 1 , characterized in that in the alkoxide radical OCH 2 R 6 , R 6 is —CHR 10 R 11 where R 10 and R 11 independently stand for alkyl radicals having 1 to 18 carbon atoms.
11. The solution according to claim 1 , characterized in that in the aprotic solvent is an aliphatic hydrocarbon or an aromatic hydrocarbon selected from the group consisting of cyclohexane, methylcyclohexane, hexane, heptane, octane, nonane, decane, dodecane, decalin, and commercially available benzene fractions, benzene, toluene, ethylbenzene, xylenes, and cumene.